# How to get a list of available appearance/styles?

This is a basic question but I haven't found any answer yet :/

Available appearances for Button[] are mentioned in Help, those are "Palette", "FramedPalette", "DialogBox" and so on. But is this all? How could I get to know? For example there is also used in Help "NoOp" option in MouseAppearance[]. Are there any others in addition to those mentioned in Help.

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I recently had a exchange of email with WRI tech suppor on a related matter, SetterBar. This was their position on that subject: